CN110366653B - Piping structure and method for installing butterfly valve into existing pipe - Google Patents

Piping structure and method for installing butterfly valve into existing pipe Download PDF

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Publication number
CN110366653B
CN110366653B CN201880013429.0A CN201880013429A CN110366653B CN 110366653 B CN110366653 B CN 110366653B CN 201880013429 A CN201880013429 A CN 201880013429A CN 110366653 B CN110366653 B CN 110366653B
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China
Prior art keywords
existing pipe
rubber
opening
valve
outer peripheral
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CN201880013429.0A
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Chinese (zh)
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CN110366653A (en
Inventor
横山群平
佐藤康成
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Suiken Co Ltd
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Suiken Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
    • F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
    • F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
    • F16K1/226—Shaping or arrangements of the sealing
    • F16K1/2261—Shaping or arrangements of the sealing the sealing being arranged on the valve member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
    • F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
    • F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
    • F16K1/226—Shaping or arrangements of the sealing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
    • F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
    • F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
    • F16K1/226—Shaping or arrangements of the sealing
    • F16K1/2268—Sealing means for the axis of rotation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/02—Construction of housing; Use of materials therefor of lift valves
    • F16K27/0209—Check valves or pivoted valves
    • F16K27/0218—Butterfly valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/10—Means for stopping flow from or in pipes or hoses
    • F16L55/105—Closing devices introduced radially into the pipe or hose
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
    • F16K3/22—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K41/00—Spindle sealings
    • F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
    • F16K41/08—Spindle sealings with stuffing-box ; Sealing rings with at least one ring provided with axially-protruding peripheral closing-lip
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L41/00—Branching pipes; Joining pipes to walls
    • F16L41/04—Tapping pipe walls, i.e. making connections through the walls of pipes while they are carrying fluids; Fittings therefor
    • F16L41/06—Tapping pipe walls, i.e. making connections through the walls of pipes while they are carrying fluids; Fittings therefor making use of attaching means embracing the pipe

Abstract

The method for installing the butterfly valve into the existing pipe comprises the following steps: an assembling step of assembling the sealed housing to the existing pipe; a cutting step of forming a groove-like first opening extending in the tube axis direction of the existing tube; a second piercing step of forming a second opening in a circular shape in a portion of the existing pipe facing the first opening; and an insertion step of inserting a butterfly-shaped valve element integrated with a valve rod penetrating the first opening and the second opening into the existing pipe 1 through the first opening in an open valve state until the tip end of the valve rod protrudes from the second opening.

Description

Piping structure and method for installing butterfly valve into existing pipe
Technical Field
The invention relates to the insertion of a butterfly valve in a non-stop state.
Background
A technique for inserting a butterfly valve into a pipe having an existing pipe in a non-stop state is known. In addition, a valve body of a butterfly valve that is formed with a long groove in an existing pipe in a pipe axis direction of the existing pipe and is in contact with an inner peripheral surface of the existing pipe is inserted into the existing pipe.
Prior art documents
Patent document
Patent document 1: JP2000-130682A (FIGS. 1-10)
Disclosure of Invention
However, in the above-described conventional butterfly valve, the inner lid itself is fitted into the linear cut groove. This fitting structure makes it difficult to insert the valve.
On the other hand, if a gap exists between the cutting groove and the inner lid, the fluid leaks from the upstream to the downstream through the gap when the valve is closed. That is, the water stopping performance of the butterfly valve is degraded.
In the above-described conventional technique, the rubber on the upper portion of the valve body always comes into contact with the plate rubber of the inner lid with a strong pressure. The rubbers are kept in contact with each other under this pressure, which causes the rubbers to adhere to each other. Therefore, the water stopping performance may be degraded.
Therefore, an object of the present invention is to facilitate valve insertion and improve water stopping performance of a butterfly valve in a method and a piping structure for inserting the butterfly valve into an existing pipe from a groove formed in the existing pipe.
The piping structure of the present invention has a butterfly valve provided in an existing pipe, and includes: an existing pipe 1 having a first opening 11 in the form of a long groove in a pipe axis direction S; an inner lid 3 that closes the first opening 11; a valve rod 21 extending in the vertical direction along the radial direction D of the existing pipe 1 and penetrating through the first opening 11; and a butterfly-shaped spool 22 housed in the existing pipe 1 so as to be rotatable together with the valve rod 21, the spool 22 including: a disc-shaped valve body 22 b; an outer peripheral rubber R1 disposed along the outer periphery of the valve body 22 b; and an upper rubber R2 disposed around the upper portion 21B of the valve rod 21, disposed in a part of the first opening 11, and rotating together with the valve rod 21, wherein the upper rubber R2 includes a pair of sealing portions R22, and the pair of sealing portions R22 are configured to be in a non-sealing state between the pair of sealing portions R22 and the respective end surfaces 11f in a state of being separated from the respective end surfaces 11f of the pair of end surfaces 11f that are long in the tube axis direction S and form the first opening 11 in an open valve state in which the valve body 22 is open, and to be in a sealing state of sealing between the pair of sealing portions R22 and the inner surface 31 of the inner lid 3 and sealing between the pair of sealing portions R22 and the respective end surfaces 11f in a closed valve state in which the valve body 22 is closed.
With this configuration, in the valve-open state, the pair of sealing portions R22 are in the non-sealing state separated from the end surfaces 11 f. Therefore, when the valve body 22 in the valve-opened state is inserted into the existing pipe 1 from the first opening 11, the valve body 22 can be smoothly inserted into the existing pipe 1 from the first opening 11 without the seal portion R22 coming into contact with the end surface 11f of the first opening 11.
On the other hand, when the butterfly valve 2 is closed by rotating the valve body 22 around the valve rod 21, the seal portion R22 comes into contact with the end surface 11f of the first opening 11. Therefore, in the valve-closed state, the upper portion of the valve body 22 can be sealed from the end surface 11f of the first opening 11 of the existing pipe 1.
Drawings
Fig. 1A and 1B are schematic perspective views each showing a part of a structure and an assembling method of a butterfly valve according to embodiment 1 of the present invention.
Fig. 2 is a schematic perspective view showing a part of a structure and an assembling method of a butterfly valve according to embodiment 1 of the present invention.
Fig. 3A and 3B are schematic perspective views each showing a part of a structure and an assembling method of a butterfly valve according to embodiment 1 of the present invention.
Fig. 4A and 4B are schematic perspective views each showing a part of the structure and the assembling method of the butterfly valve according to embodiment 1 of the present invention.
Fig. 5A and 5B are schematic perspective views each showing a part of the structure and the assembling method of the butterfly valve according to embodiment 1 of the present invention.
Fig. 6A and 6B are schematic perspective views each showing a part of the structure and the assembling method of the butterfly valve according to embodiment 1 of the present invention.
Fig. 7 is a schematic cross-sectional view schematically showing a part of the steps of the method of example 1 of the present invention.
Fig. 8 is a schematic cross-sectional view schematically showing a part of the steps of the method of example 1 of the present invention.
Fig. 9 is a schematic cross-sectional view schematically showing a part of the steps of the method of example 1 of the present invention.
Fig. 10 is a schematic cross-sectional view schematically showing a part of the steps of the method of example 1 of the present invention.
Fig. 11 is a schematic cross-sectional view schematically showing a part of the steps of the method of example 1 of the present invention.
Fig. 12A and 12B are a schematic vertical sectional view and a schematic transverse sectional view, respectively, showing a system in a cutting process of example 1.
Fig. 13 is a schematic vertical cross-sectional view showing a state before insertion of the butterfly valve according to embodiment 1.
Fig. 14A and 14B are a schematic vertical cross-sectional view and a schematic transverse cross-sectional view, respectively, showing a state in which the butterfly valve according to embodiment 1 is being inserted.
Fig. 15A and 15B are a schematic vertical cross-sectional view and a schematic transverse cross-sectional view, respectively, showing a state immediately before the completion of insertion of the butterfly valve according to embodiment 1.
Fig. 16A and 16B are a schematic vertical cross-sectional view and a schematic transverse cross-sectional view, respectively, showing a state immediately after insertion of the butterfly valve according to embodiment 1.
Fig. 17A and 17B are a schematic longitudinal sectional view and a schematic transverse sectional view, respectively, of a butterfly valve according to embodiment 1 to which a speed reducer is attached.
Fig. 18A and 18B are a schematic vertical sectional view and a schematic transverse sectional view, respectively, showing a state in which the butterfly valve according to embodiment 1 is closed.
Fig. 19A and 19B are a schematic perspective view showing a part of the butterfly valve of embodiment 2 in a closed state, and a bottom view of the inner lid, respectively.
Fig. 20 is a schematic perspective view showing an opened state of the butterfly valve according to embodiment 3 partially cut away.
Fig. 21 is a schematic perspective view of a butterfly valve according to embodiment 3, partially broken away in a closed valve state.
Fig. 22A and 22B are a transverse sectional view and a longitudinal sectional view, respectively, showing an opened state of the butterfly valve.
Fig. 23A and 23B are plan views partially cut away the piping structure of example 4.
Fig. 24 is a front view partially cut away the piping structure of example 4.
Fig. 25 is a cross-sectional view showing an example of the outer circumferential rubber.
Fig. 26A and 26B are schematic perspective views each showing a part of the structure and the assembly method of the butterfly valve according to embodiment 4.
Fig. 27 is a schematic perspective view showing a piping structure in an open state.
Fig. 28A is a schematic perspective view showing a part of the butterfly valve according to embodiment 4 in a closed state, and fig. 28B is a bottom view of the inner lid.
Fig. 29A is a front view showing a sealing structure of an upper portion of the butterfly valve, and fig. 29B is a bottom view showing a part of the inner lid.
Fig. 30 is a schematic perspective view of the inner lid.
Fig. 31 is a sectional view showing a sealing structure of an upper portion.
Fig. 32 is a schematic perspective view showing another example of the upper rubber.
Fig. 33 is a schematic perspective view showing another example of the upper sealing structure, which is another example of the upper rubber and the cap rubber.
In fig. 23A, 23B, and 25, the cross section of the outer periphery rubber is shown in gray for easy understanding of the cross sectional shape of the outer periphery rubber.
In fig. 27 to 33, the cap rubber is illustrated as being painted with a gray paint in order to make it easy to understand the shape of the cap rubber.
Detailed Description
Preferably, the pair of sealing portions R22 are each formed by a large diameter portion R22 protruding in the direction Dx in which the outer peripheral rubber R1 extends, and the large diameter portion R22 includes a top surface F1 that contacts the inner surface 31 of the inner lid 3 in the valve-closed state and a front end surface F2 that contacts each of the end surfaces 11F in the valve-closed state.
In this case, in the valve-closed state, the top surface F1 of the large diameter portion R22 contacts the inner surface 31, and the front end surface F2 of the large diameter portion R22 contacts the end surface 11F of the first opening 11, thereby sealing the upper portion of the butterfly valve.
Preferably, the upper rubber R2 is formed in an annular and disk shape defining a through hole Ro through which the valve rod 21 passes.
In this case, the upper rubber R2 is formed in a ring shape and a disk shape, and the upper rubber R2 is stably fixed to the upper portion of the butterfly valve.
Preferably, the upper rubber R2 is disposed such that the large diameter portion R22 and a pair of small diameter portions R21 having a diameter D1 smaller than the diameter D2 of the large diameter portion R22 are alternately connected in the circumferential direction of the upper rubber R2.
According to this structure, the upper rubber R2 has a small diameter portion R21 with a small diameter and a large diameter portion R22 with a large diameter.
Therefore, when the valve body 22 in the valve-opened state is inserted into the existing pipe 1 from the first opening 11, the valve body 22 can be smoothly inserted into the existing pipe 1 from the first opening 11 without the small diameter portion R21 coming into contact with the end surface 11f of the first opening 11.
On the other hand, when the butterfly valve 2 is closed by rotating the valve body 22 around the valve rod 21, the large diameter portion R22 contacts the end surface 11f of the first opening 11. Therefore, in the valve-closed state, the upper portion of the valve body 22 can be sealed from the end surface 11f of the first opening 11 of the existing pipe 1.
In a preferred configuration, an annular cap rubber R for sealing between the inner cap 3 and the outer peripheral surface 1F of the existing pipe 1 is fixed to the inner surface 31 of the inner cap 3.
In this case, the sealing between the existing pipe 1 and the inner cap 3 can be achieved by simply pressing the inner cap 3 against the outer peripheral surface 1F of the existing pipe 1. Therefore, the valve can be easily inserted without stopping the flow without fitting the inner lid 3 into the first opening 11.
More preferably, the cap rubber R includes an auxiliary seal portion R4 that contacts the large diameter portion R22 in the valve-closed state.
In this case, in the valve-closed state in which the valve body 22 is closed, the large-diameter portion R22 of the upper rubber R2 contacts the auxiliary seal portion R4, and the seal between the cap rubber R and the upper rubber R2 is achieved. Therefore, the water stopping performance is further improved.
Preferably, in the valve-closed state, the valve body 22 partitions a space in the existing pipe 1 into an upstream side Sf on which a fluid pressure acts in the existing pipe 1 and a downstream side Df on which the fluid pressure in the existing pipe 1 is reduced, and in the valve-closed state, self-seal grooves G1 and G2 for receiving the fluid pressure and pressing an outer peripheral end R10 of the outer peripheral rubber R1 toward the inner peripheral surface 1S of the existing pipe 1 are formed in the upstream side Sf of the outer peripheral rubber R1.
In this case, the outer rubber R1 is pressed against the inner circumferential surface 1S of the existing pipe 1 by applying a fluid pressure on the upstream side from the seal grooves G1 and G2. Therefore, the compression amount of the outer periphery rubber R1 is small, and the rotation torque at the time of valve closing can be reduced.
More preferably, the piping structure is characterized in that the outer peripheral rubber R1 includes a first semi-peripheral rubber R11 and a second semi-peripheral rubber R12, the first semi-peripheral rubber R11 is attached to a portion of the valve body 22 that rotates from the upstream side Sf toward the downstream side Df when the valve body 22 is closed, the second semi-peripheral rubber R12 is attached to a portion of the valve body 22 that rotates from the downstream side Df toward the upstream side Sf when the valve body 22 is closed, and a rigidity of an outer peripheral end portion R10 of the second semi-peripheral rubber R12 is higher than that of an outer peripheral end portion R10 of the first semi-peripheral rubber R11.
The first semi-circumferential rubber R11 has low rigidity, and therefore contributes to reduction of the rotational torque at the time of valve closing.
On the other hand, the second half-cycle rubber R12 has high rigidity, and therefore, the outer peripheral end portion R10 can be prevented from unexpectedly deforming (curling) when the valve is closed.
Preferably, the piping structure includes a presser 4, and the presser 4 compresses the cap rubber R between the outer peripheral surface 1F of the existing pipe 1 and the inner surface 31 of the inner cap 3 by pressing the inner surface 31 of the inner cap 3 toward the outer peripheral surface 1F of the existing pipe 1.
In this case, the cap rubber R is compressed between the existing pipe 1 and the inner cap 3, and the water tightness between the outer peripheral surface 1F of the existing pipe 1 and the inner surface 31 of the inner cap 3 is improved.
Preferably, the existing pipe 1 defines a second opening 12 having a circular shape at a position facing the first opening 11, and the valve rod 21 has a lower end portion 21T penetrating the second opening 12 and partially protruding from the existing pipe 1.
In this case, by supporting the lower end portion 21T protruding from the second opening 12, the upper end portion (an example of the upper portion) 21B and the lower end portion 21T of the valve rod 21, that is, both end portions of the valve rod 21 can be axially supported. Therefore, not only can the valve body 22 and the valve rod 21 be reduced in weight, but also the butterfly valve can be reduced in deformation, and the water-stopping performance can be improved.
More preferably, the piping structure further includes a rubber ring R3, the rubber ring R3 being attached to the lower end portion 21T of the valve rod 21 and sealing a gap between the lower end portion 21T of the valve rod 21 and the inner circumferential surface 1S of the existing pipe 1.
The rubber ring R3 improves the water stopping performance of the lower end portion 21T.
More preferably, the piping structure includes a presser 4, and the presser 4 presses the inner lid 3 against the outer peripheral surface 1F of the existing pipe 1, thereby pressing the upper rubber R2 against the inner surface 31 of the inner lid 3, and pressing the rubber ring R3 against the inner peripheral surface 1S of the existing pipe 1.
When the butterfly valve is closed from the open valve state, a portion of the valve body 22 that is away from the valve rod 21 rotates so as to draw a large arc. Therefore, the outer periphery rubber R1 at this position is compressed by a large amount, and therefore high water tightness can be obtained.
On the other hand, when the valve is closed, a sufficient amount of compression is not easily obtained for the upper rubber R2 and the rubber ring R3 at the portions of the valve body 22 close to the upper end portion 21B and the lower end portion 21T of the valve rod 21. Therefore, the upper rubber R2 and the rubber ring R3 need to be compressed in advance in the axial direction of the valve rod 21 in the valve-opened state.
In this example, the upper rubber R2 and the rubber ring R3 can be compressed in advance in the axial direction of the valve rod 21 by the pusher 4. Therefore, high watertight performance is exerted.
Preferably, the piping structure further includes a closed casing 5, the closed casing 5 surrounding a portion of the existing pipe 1 where the first opening 11 and the second opening 12 are formed, the upper end portion 21B and the lower end portion 21T of the valve rod 21, and the inner lid 3, and the closed casing 5 includes a first protruding pipe portion 51 surrounding the inner lid 3 from four sides, and an outer lid 55 coupled to the first protruding pipe portion 51 and covering the inner lid 3.
Preferably, the pressing member 4 includes: a plurality of first pressing bolts 4b supported by a pipe wall of the first projecting pipe portion 51, advancing and retreating in a tangential direction of the existing pipe 1, and pressing the inner lid 3 against an outer peripheral surface of the existing pipe 1; and a plurality of second pressing bolts 4c supported by the pipe wall of the outer cap 55, and configured to advance and retreat in the radial direction of the existing pipe 1, and press the inner cap 3 against the outer circumferential surface 1F of the existing pipe 1.
In this case, first, the inner lid 3 is pressed by the first pressing bolt 4 b. Then, the outer lid 55 is joined to the first protruding tube portion 51 and covers the inner lid 3 from above. After that, the inner lid 3 is further pressed by the second pressing bolt 4 c.
In this way, by pressing the inner lid 3 with the second pressing bolt 4c different from the first pressing bolt 4b, the stroke of pressing the inner lid 3 can be increased. Therefore, the reliability of the sealing of the upper portion of the valve body 22 and the inner lid 3 is improved.
This structure can be obtained by, for example, the following preferred method.
A method of installing a butterfly valve 2 into an existing pipe 1, comprising: an assembly step of assembling a sealed casing 5, which surrounds a part of an existing pipe 1 in an airtight state, to the existing pipe 1; a cutting step of forming a first opening 11 in a long groove shape in the pipe axis direction S by a cutting tool 60 that penetrates into the sealed housing 5; a piercing step of piercing a circular second opening 12 in a portion facing the first opening 11 by a piercing tool 62 that enters the sealed housing 5; an insertion step of inserting a butterfly-shaped valve body 22, which is integrated with a valve rod 21 that penetrates the first opening 11 and the second opening 12, into the existing pipe 1 through the first opening 11 in an open state until a lower end portion 21T of the valve rod 21 protrudes from the second opening 12; and a collar fitting step of fitting a collar 53 to the outer periphery of the lower end portion 21T of the valve rod 21 that has entered the bearing portion 50 of the sealed housing 5 in the insertion step.
In this method, the collar 53 is attached to the outer periphery of the lower end portion 21T of the valve rod 21 that has entered the bearing portion 50 of the sealed housing 5 in the insertion step. Therefore, a large gap is formed between the lower end portion 21T of the valve rod 21 and the bearing portion 50 of the sealed housing 5 in the insertion step, and the lower end portion 21T of the valve rod 21 can be easily guided to the bearing portion 50. On the other hand, after the collar mounting step, the lower end portion 21T can be supported with high accuracy at the bearing portion 50 of the hermetic case 5. Therefore, the insertion of the spool 22 can be smoothly performed, and high water stopping performance can be awaited at the later stage of the insertion.
Preferably, the method further includes a sealing step of pressing the inner cap 3 closing the first opening 11 and compressing an annular cap rubber R for sealing between the inner cap 3 and the existing pipe 1, the sealing step being performed after the collar assembling step.
If the sealing step is performed before the collar assembling step, the axis of the valve rod 21 is likely to be displaced. In contrast, the sealing step is performed after the axial line of the valve rod 21 is centered in the collar assembling step, so that the valve rod 21 can be supported with high accuracy, and high water stopping performance can be expected.
Preferably, the inner lid 3 includes, on an inner surface side thereof: a first engaging projection 301 that projects toward the first opening 11 and engages with an end surface 11f of the first opening 11 in the circumferential direction of the existing pipe 1; and a second engaging projection 302 that projects toward the first opening 11 and engages with an end surface 11f of the first opening 11 in the tube axis direction S.
The inner lid 3 is pressed against the outer peripheral surface 1F of the existing pipe 1, but if the inner lid 3 is displaced with respect to the first opening 11 at this time, the upper rubber R2 of the butterfly valve 2 attached to the inner lid 3 is displaced with respect to the first opening 11, and therefore, the sealing performance by the upper rubber R2 is likely to be degraded.
In contrast, the first engaging projection 301 and the second engaging projection 302 engage with the end surface 11f of the first opening 11 in the tube axis direction S and the circumferential direction, and the positional deviation can be suppressed. Therefore, the reliability of sealing the first opening 11 is improved.
Preferably, the outer diameter D4 of the outer peripheral rubber R1 is larger than the inner diameter D3 of the existing pipe 1.
In this way, the outer diameter D4 of the outer periphery rubber R1 is larger than the inner diameter D3 of the existing pipe 1, and the valve body 22 can stop the flow of the fluid in the existing pipe 1.
Another preferred method of loading a butterfly 2 into an existing pipe 1 comprises: an assembly step of assembling a sealed casing 5, which surrounds a part of an existing pipe 1 in an airtight state, to the existing pipe 1; a first punching step of forming a circular opening 10 from the existing pipe 1 by a first hole saw 61 penetrating into the sealed casing 5 and cutting a circular first cut piece S1; a cutting step of forming a groove-like first opening 11 extending from the circular opening 10 to both sides in the pipe axis direction S of the existing pipe 1 by a cutting tool 60 that penetrates into the sealed housing 5; a second punching step of forming a circular second opening 12 at a position facing the circular opening 10 by a second hole saw 62 inserted into the sealed case 5 and cutting a second cut piece S2; and an insertion step of inserting a butterfly-shaped valve body 22, which is integrated with the valve rod 21 that penetrates the first opening 11 and the second opening 12, into the existing pipe 1 through the first opening 11 in the valve-opened state until the lower end portion 21T of the valve rod 21 protrudes from the second opening 12.
In this case, the valve rod 21 can be supported near the first opening 11 and the second opening 12 of the valve rod 21, that is, both the upper end portion 21B and the lower end portion 21T of the valve rod 21.
In addition, the perforation is performed by the first hole saw 61 different from the cutting to form the groove. Therefore, the first opening 11 is formed in a shape matching the shape of the butterfly valve 2.
Preferably, the width W11 of the groove-like first opening 11 formed by the cutting tool 60 is smaller than the diameter D10 of the circular-shaped opening 10 formed by the first hole saw 61.
In this case, a large circular opening 10 can be obtained that matches the size of the valve rod 21 of the butterfly valve 2 in the circumferential direction.
Preferably, the method comprises: measuring an outer diameter D4 of the existing pipe 1; measuring the thicknesses T1 and T2 of the first cut piece S1 and the second cut piece S2; and a step of calculating an inner diameter D3 of the existing pipe 1 by subtracting the thicknesses T1 and T2 of the first and second slices S1 and S2 from the measured outer diameter D4.
The pipe is manufactured based on the outer diameter standard, but the inner diameter of the pipe cannot be clearly determined according to the outer diameter, which becomes a factor of lowering the water stopping performance of the butterfly valve 2. In addition, the thickness may vary in the existing pipe 1.
In contrast, the first slice S1 and the second slice S2 are obtained, and the inner diameter D3 is calculated from the thicknesses T1 and T2 and the outer diameter D4 of the existing pipe 1, whereby the accurate inner diameter D3 of the existing pipe 1 can be known. This improves the water stopping performance.
Preferably, the method for loading the butterfly 2 into the existing pipe 1 comprises the following steps: an assembly step of assembling a sealed casing 5, which surrounds a part of an existing pipe 1 in an airtight state, to the existing pipe 1; a cutting step of forming a groove-like first opening 11 extending in the pipe axial direction S of the existing pipe 1 by a cutting tool 60 that penetrates into the sealed housing 5; a punching step of forming a circular second opening 12 at a position facing the first opening 11 by a hole saw 62 inserted into the sealed case 5 and cutting out a cut piece S2; an insertion step of inserting a butterfly-shaped valve body 22, which is integrated with a valve rod 21 that penetrates the first opening 11 and the second opening 12, into the existing pipe 1 through the first opening 11 in an open state until a lower end portion 21T of the valve rod 21 protrudes from the second opening 12; measuring an outer diameter D4 of the existing pipe 1; a step of measuring a thickness T2 of the cut piece S2; and a step of calculating an inner diameter D3 of the existing pipe 1 by subtracting a value 2 times the thickness T2 of the slice S2 from the measured outer diameter D4.
In this case, the exact inner diameter D3 of the existing pipe 1 can be known by obtaining the slice S2 and calculating the inner diameter D3 from the thickness T2 and the outer diameter D4 of the existing pipe 1. This improves the water stopping performance.
Another preferred embodiment relates to a system for incorporating a butterfly valve 2 into an existing pipe 1, including: a hermetic case 5 surrounding a part of the existing pipe 1 in a hermetic state and having a first protruding pipe portion 51 protruding in a radial direction D of the existing pipe 1; a working valve V connected to the first projecting pipe portion 51 of the sealed case 5; a slider 7 which is disposed on the opposite side of the working valve V from the first projecting pipe portion 51 and is movable in the pipe axis direction S of the existing pipe 1; a working housing 8 which is connected to the opposite side of the working valve V from the first projecting tube portion 51, slidably supports the slider 7, and has an airtight chamber 80 for applying an internal pressure in the existing tube 1 against the first surface 71 of the slider 7 to a second surface 72 of the slider 7 on the opposite side from the first surface 71; a mover 70 for moving the slider 7 relative to the work case 8 in the pipe axis direction S; and a cutting tool 60 connected to the slider 7, protruding toward the existing pipe 1, and forming a first opening 11 in the existing pipe 1 in a long groove shape along the pipe axis direction S by moving the slider 7.
A preferred method of using the system is to install a butterfly valve 2 into an existing pipe 1, comprising: an assembling step of assembling the sealed casing 5 to the existing pipe 1 so that the sealed casing 5 surrounds a part of the existing pipe 1 in an airtight state; a cutting step of forming a first opening 11 in a shape of a long groove in the pipe axis direction S by the cutting tool 60 entering the sealed housing 5; an insertion step of inserting a butterfly-shaped valve body 22, which is integrated with a valve rod 21 that penetrates the first opening 11, into the existing pipe 1 through the first opening 11 in an open state, the cutting step including: a moving step of moving the slider 7 in the pipe axis direction S by the moving member 70 to move the cutting tool 60 in the pipe axis direction S; and a pressurizing step of introducing a pressure fluid into the airtight chamber 80 to apply pressure to the second surface 72 of the slider 7.
In this system and method, the slider 7 different from the work valve V is moved in the pipe axis direction S to move the cutting tool 60 in the pipe axis direction S. Therefore, the first opening 11 can be formed more accurately than in the case where the hermetic case 5 is slid.
Further, the slider 7 is moved while introducing a pressure fluid into the airtight chamber 80 to apply pressure to the second surface 72 of the slider 7. Therefore, the generation of the bias voltage in the slider 7 can be suppressed, and the movement of the slider 7 becomes easy.
Preferably, the butterfly valve provided in the existing pipe includes: an existing pipe 1 having a first opening 11 in the form of a long groove in a pipe axis direction S; an inner lid 3 that closes the first opening 11; a mandrel 21 that penetrates the first opening 11 and extends in the radial direction D of the existing pipe 1; and a butterfly-shaped spool 22 housed in the existing pipe 1 so as to be rotatable together with the valve rod 21, the spool 22 including: a disc-shaped valve body 22 b; an outer peripheral rubber R1 disposed along the outer periphery of the valve body 22 b; an upper rubber R2 disposed around the upper end 21B of the valve rod 21, disposed in a part of the first opening 11, and in contact with the inner surface 31 of the inner lid 3; a first saddle portion surrounding a portion of the existing pipe 1 where the first opening 11 is formed, the upper end portion 21B of the valve rod 21, and the inner lid 3; a second saddle portion surrounding a portion of the existing pipe 1 where the second opening 12 is formed and a lower end portion 21T of the valve rod 21; a plurality of bands extending circumferentially between the first and second saddles; and a plurality of fastening bolts for fastening the band and the saddles to each other.
In this case, since both the first and second saddles are small in the circumferential direction, the first and second saddles are likely to be along the outer circumferential surface of the existing pipe 1.
Features that are described and/or illustrated in connection with one or more of the described embodiments or examples below can be used in the same or similar fashion in one or more other embodiments or examples, and/or in combination with or instead of the features of the other embodiments or examples.
The invention will be more clearly understood from the following description of preferred embodiments with reference to the accompanying drawings. However, the embodiments and the drawings are only for illustration and description and are not intended to determine the scope of the present invention. The scope of the invention is to be determined solely by the scope of the claims. In the drawings, like reference characters designate like or corresponding parts throughout the several views.
Examples
Hereinafter, embodiment 1 of the present invention will be described with reference to the drawings.
The configuration of the butterfly valve will be described in brief with reference to fig. 1A to 6B.
As shown in fig. 5A, the butterfly valve 2 is provided in an existing pipe 1.
The butterfly valve 2 includes an existing pipe 1, an inner lid 3, a valve rod 21, and a butterfly valve body 22.
As shown in fig. 2, the existing pipe 1 has a first opening 11 in the form of a long groove in the pipe axis direction S. The existing pipe 1 defines a second opening 12 having a circular shape at a position opposed to the first opening 11.
The inner lid 3 closes the first opening 11.
The valve rod 21 extends in the vertical direction along the radial direction D of the existing pipe 1 and penetrates the first opening 11. The valve rod 21 has a lower end portion 21T penetrating the second opening 12 and partially protruding from the existing pipe 1.
As shown in fig. 3, a butterfly-shaped valve body 22 is housed in the existing pipe 1 so as to be rotatable together with the valve rod 21.
The valve body 22 includes a disc-shaped valve main body 22b, an outer peripheral rubber R1, an upper rubber R2, and a rubber ring R3. These rubbers R1 to R3 rotate together with the valve rod 21.
The outer peripheral rubber R1 is disposed along the outer periphery of the valve main body 22 b.
The upper rubber R2 of fig. 3A is disposed around the upper portion 21B of the valve rod 21 and at a portion of the first opening 11, and contacts the inner surface 31 of the inner lid 3 of fig. 4B. The upper rubber R2 has a through-hole Ro through which the upper portion 21B of the valve rod 21 passes.
A rubber ring R3 is fitted to the lower end portion 21T of the valve rod 21 to seal the lower end portion 21T of the valve rod 21 from the inner circumferential surface 1S of the existing pipe 1.
The upper rubber R2 in fig. 3B has a pair of small diameter portions R21 and a pair of large diameter portions (an example of a seal portion) R22.
The two small diameter portions R21 in fig. 3B have a first diameter D1 that is not in contact with the end surface 11f of the first opening 11 in the open valve state where the spool 22 is open.
The two large diameter portions R22 in fig. 3B are larger than the first diameter D1, and have a second diameter D2 (fig. 3B) that contacts the end surface 11f of the first opening 11 in the valve-closed state where the spool 22 in fig. 6B is closed.
That is, the radius of the large diameter portion R22 is larger than the radius of the small diameter portion R21.
In fig. 6B, a cap rubber R is provided to the inner cap 3. The cap rubber R is an annular rubber (see fig. 19B) for sealing between the inner cap 3 and the outer peripheral surface 1F of the existing pipe 1, and is fixed to the inner surface of the inner cap 3.
In fig. 5B, the butterfly valve 2 includes a retainer 4.
The presser 4 presses the inner surface 31 of the inner cap 3 against the outer peripheral surface 1F of the existing pipe 1, thereby compressing the cap rubber R between the outer peripheral surface 1F of the existing pipe 1 and the inner surface 31 of the inner cap 3.
Further, the pressing tool 4 presses the inner cap 3 against the outer circumferential surface 1F of the existing pipe 1, thereby pressing the upper rubber R2 of fig. 5A against the inner surface 31 of the inner cap 3 and pressing the rubber ring R3 against the inner circumferential surface 1S of the existing pipe 1.
The outer diameter D4 of the outer peripheral rubber R1 is larger than the inner diameter D3 of the existing pipe 1 of fig. 2. Thereby, the butterfly valve 2 of fig. 6A is fully closed at an angle smaller than 90 °.
As shown in fig. 17A and 17B, the closed casing 5 surrounds the portion of the existing pipe 1 where the first opening 11 and the second opening 12 are formed, the upper portion 21B and the lower portion 21T of the valve rod 21, the inner lid 3, and the like.
In fig. 17A, the sealed case 5 includes, for example, a first divided case 5a and a second divided case 5 b. The two split cases 5a, 5b are fitted with rubber packing 54, and the rubber packing 54 seals between the rubber packing 54 and the existing pipe 1 and between the two split cases 5a, 5 b. The first split case 5a and the second split case 5b are integrally provided with a first protruding pipe portion 51 and a second protruding pipe portion 52, respectively.
The speed reducer 9 is attached to the first projecting pipe portion 51 of fig. 17A via an outer cover 55. The decelerator 9 is connected to an upper end portion of the valve rod 21.
The inner lid 3 is housed in the first protruding tube portion 51 of fig. 17B. The inner lid 3 is pressed toward the outer peripheral surface 1F of the existing pipe 1 by the presser 4. The first pressing bolt 4b of the pressing piece 4 is supported by the pipe wall of the first protruding pipe portion 51.
A small partition valve 56 is connected to the second projecting tube portion 52 in fig. 17B. A cover plate 57 is attached to a flange of the small partition valve 56, whereby the second projecting pipe portion 52 is closed.
A collar 53 is disposed in the second projecting tube portion 52 of fig. 17B. The collar 53 is fitted to the inside of the second projecting pipe portion 52 and to the lower end portion 21T of the butterfly valve 2.
Next, an outline of an example of a method (construction method) of incorporating the butterfly valve 2 into the existing pipe 1 will be described.
First, as shown in fig. 7 (a), an assembly step of assembling the sealed casing 5 surrounding a part of the existing pipe 1 in an airtight state to the existing pipe 1 is performed.
The existing pipe 1 is corrected for the flat by the correction member 90 shown in fig. 7 (b) as needed.
Next, the work valve V (see fig. 14B) is attached to the first split case 5a of fig. 7 (c), and the slider 7 and the work case 8 are attached.
Thereafter, the first piercing machine 81 is attached to the work housing 8 in fig. 8 (a). On the other hand, the partition valve 56 is attached to the second projecting pipe portion 52, and further, the second piercing machine 82 is attached.
After the mounting, the first and second punching steps shown in fig. 8 (a) are performed.
That is, the first hole saw 61 penetrating into the sealed case 5 forms the circular opening 10 from the existing pipe 1 and cuts the circular first cut piece S1 of fig. 1A. On the other hand, the second hole saw 62 penetrating into the hermetic case 5 in fig. 8 (a) forms a circular second opening 12 at a position facing the circular opening 10, and cuts out a second cut piece S2 in fig. 1A.
After the first piercing step, an end mill type piercing machine 83 is attached to the slider 7 in fig. 8 (b) instead of the first piercing machine 81. After this mounting, the cutting tool 60 that has penetrated into the sealed housing 5 performs a cutting process of forming the groove-like first openings 11 that extend from the circular opening 10 to both sides of the existing pipe 1 in the pipe axial direction S as shown in fig. 9 (a) and 1B.
Here, the width W11 of the groove-like first opening 11 formed by the cutting tool 60 of fig. 1B is smaller than the diameter D10 of the circular-shaped opening 10 of fig. 1A formed by the first hole saw 61 (fig. 8 (a)).
Thereafter, as shown in fig. 9 (b), the work valve V is closed, and the slider 7, the work case 8, the punch 83, and the like are removed.
After the removal, as shown in fig. 10 or 13, the work tank 92 is stacked on the work valve V. At this time, the work tank 92 is stacked on the work valve V in a state where the valve rod 21, the valve body 22, and the inner lid 3 of the butterfly valve 2 are housed in the work tank 92.
After that, the working valve V shown in fig. 14A and 14B is opened, and the insertion step is performed.
That is, as shown in fig. 3A, 14A and 15A, an insertion step of inserting a butterfly-shaped valve body 22 integrated with a valve rod 21 penetrating the first opening 11 and the second opening 12 into the existing pipe 1 through the first opening 11 in an open state until a lower end portion 21T of the valve rod 21 protrudes from the second opening 12 is performed.
Next, the collar mounting step (a) of fig. 11 and the sealing step (b) of fig. 11 are performed.
That is, a collar mounting step of mounting the collar 53 on the outer periphery of the lower end portion 21T of the valve rod 21 that has entered the bearing portion 50 of the sealed housing 5 in the insertion step shown in fig. 15A is performed.
The sealing process is performed after the collar assembling process. That is, the inner cap 3 closing the first opening 11 is pressed by the pressing tool 4 of fig. 5A, and the annular cap rubber R sealing the gap between the inner cap 3 and the existing pipe 1 is compressed (fig. 5B).
Thereafter, the pressing bolt 4B of the pressing piece 4 shown in fig. 11 (B) and 16B is further screwed, whereby the inner cap 3 is pressed against the outer peripheral surface 1F of the existing pipe 1. Thereby, the upper rubber R2 is pressed against the inner surface 31 of the inner lid 3, and the rubber ring R3 is pressed against the inner circumferential surface 1S of the existing pipe 1.
Thereafter, the working valve V in fig. 11 (b) is removed, and the cover plate 57 and the reducer 9 in fig. 11 (c) are attached. In this way, the installation of the existing pipe 1 to the butterfly valve 2 is completed.
The butterfly valve 2 is rotated and closed as shown in fig. 6A, 6B, 18A, and 18B as necessary. Thereby, the pipe is stopped.
Next, a method of estimating the inner diameter of the existing pipe 1 will be described.
First, in the state of fig. 7 (b), the outer diameter D4 of the existing pipe 1 is measured from the gap between the sealed casing 5 and the existing pipe 1. Then, the thicknesses T1, T2 of the first slice S1 and the second slice S2 of fig. 1A were measured. Then, the thicknesses T1 and T2 of the first and second slices S1 and S2 are subtracted from the measured outer diameter D4, thereby calculating the inner diameter D3 of the existing pipe 1.
Next, a system for sliding the cutting tool 60 of fig. 12A and 12B will be described in detail. The system includes a work valve V, a slider 7, a work case 8, a mover 70 shown in fig. 8 (b), and the like.
The slider 7 in fig. 12A is disposed on the opposite side of the working valve V from the first projecting pipe portion 51 and is movable in the pipe axial direction S of the existing pipe 1.
The working housing 8 is connected to the opposite side of the working valve V from the first projecting tube portion 51 and slidably supports the slider 7. The airtight chamber 80 of the work housing 8 applies the internal pressure inside the existing pipe 1 applied to the first surface 71 of the slider 7 against the second surface 72 on the opposite side of the first surface 71 of the slider 7.
The moving member 70 shown in fig. 8 (b) is used to move the slider 7 relative to the working housing 8 in the pipe axis direction S, and may be of a retractable type, for example.
The cutting tool 60 of fig. 12A is connected to the slider 7, protrudes toward the existing pipe 1, and forms a first opening 11 in the existing pipe 1 in a long groove shape along the pipe axis direction S by the movement of the slider 7.
Next, a method of moving the cutting tool 60 in the tube axis direction S will be described.
A moving step of moving the slider 7 of fig. 12A in the tube axis direction S by the moving member 70 (fig. 8 (b)) to move the cutting tool 60 in the tube axis direction S is performed. At this time, the pressure fluid in the existing pipe 1 is introduced into the airtight chamber 80 from the second projecting pipe portion 52 in fig. 12A in advance, and pressure is applied to the second surface 72 of the slider 7. The application of pressure may also be performed by a hydraulic pump of the hand type.
Fig. 19A and 19B show embodiment 2.
In example 2, the cap rubber R is provided with an auxiliary seal portion R4. The auxiliary seal portion R4 contacts the large diameter portion R22 in the valve-closed state.
The large-diameter portion R22 is preferably rubber using hydrogen peroxide as a vulcanizing agent, which is different from the vulcanized rubber of the cap rubber R and the upper rubber R2. This is to prevent the rubbers from sticking to each other.
Fig. 20 to 22B show embodiment 3.
In this example, the pressing tool 4 includes a plurality of first pressing bolts 4b and second pressing bolts 4 c.
The sealed case 5 includes a first projecting tube portion 51 surrounding the inner lid 3 from four sides, and an outer lid 55 coupled to the first projecting tube portion 51 and covering the inner lid 3.
As shown in fig. 22A, each of the first pressing bolts 4b is supported by the pipe wall of the first projecting pipe portion 51, advances and retreats in the tangential direction of the existing pipe 1, and presses the inner lid 3 against the outer peripheral surface of the existing pipe 1. As shown in fig. 4B and 5B, the first pressing bolt 4B may be configured to abut against a seat portion 4d having a tapered surface on the upper surface of the inner lid 31.
As shown in fig. 22B, the second pressing bolts 4c are supported by the pipe wall of the outer cap 55, and advance and retreat in the radial direction of the existing pipe 1 to press the inner cap 3 against the outer peripheral surface 1F of the existing pipe 1.
Fig. 23A to 31 show embodiment 4.
The piping structure and method of example 4 will be mainly explained about the structure and steps different from those of example 1 or example 2.
Fig. 23A to 25 show the structure of the outer periphery rubber R1 of example 4. As shown in fig. 23A and 23B, in the valve-closed state of the valve body 22, the valve body 22 partitions the space in the existing pipe 1 into an upstream side Sf on which the fluid pressure acts in the existing pipe 1 and a downstream side Df on which the fluid pressure in the existing pipe 1 is reduced.
In the valve-closed state of fig. 23B, self-seal grooves G1, G2 are formed on the upstream side Sf of the outer peripheral rubber R1, and the self-seal grooves G1, G2 are used to receive the fluid pressure and press the outer peripheral end R10 of the outer peripheral rubber R1 toward the inner peripheral surface 1S of the existing pipe 1.
In fig. 24, the outer periphery rubber R1 includes a first half periphery rubber R11 and a second half periphery rubber R12. The self-sealing grooves G1, G2 of each half-cycle rubber R12 are formed long in the circumferential direction in which each half-cycle rubber R12 extends.
As shown in fig. 23A and 23B, the first semi-circumferential rubber R11 is attached to a portion of the valve body 22 that rotates from the upstream side Sf toward the downstream side Df when the valve body 22 is closed.
The second half-cycle rubber R12 (fig. 24) is attached to a portion of the valve body 22 that rotates from the downstream side Df toward the upstream side Sf when the valve body 22 is closed.
In fig. 23B, the rigidity of the outer peripheral end R10 of the second half bead R12 is greater than that of the outer peripheral end R10 of the first half bead R11.
For example, as shown in fig. 25, in the cross section of the outer peripheral rubber R1, the outer peripheral end Ri0 of the second half peripheral rubber R12 is formed thicker than the outer peripheral end R10 of the first half peripheral rubber R11. That is, the self-sealing groove G1 of the first half bead R11 is formed to be larger at a position closer to the outer peripheral edge of the outer peripheral bead R1 than the self-sealing groove G2 of the second half bead R12.
As shown in fig. 25, relief grooves G3 and G4 are formed along the outer periphery of the valve body 22 on the inner periphery side of the half-periphery rubbers R11 and R12. In the cross section of the outer peripheral rubber R1, the escape groove G3 of the first half peripheral rubber R11 is larger than the escape groove G4 of the second half peripheral rubber R12.
In fig. 24, the respective half-circumference rubbers R11 and R12 are shorter than half of the length of the arc of the outer circumference of the butterfly valve 2.
The first half bead R11 and the second half bead R12 are each formed by, for example, extrusion molding with the same cross section. When the existing pipe 1 is a steel pipe having a weld bead, rubber having a small hardness may be disposed in a portion that comes into contact with the weld bead.
Next, the deformation of the upper rubber R2 when the butterfly valve 2 of fig. 25 is closed will be described.
As shown in fig. 23A and fig. 25 (a) and (b), when the butterfly valve 2 is rotated in the valve closing direction from the state in which the butterfly valve 2 is fully opened, the outer peripheral end R10 of the outer peripheral rubber R1 finally comes into contact with the inner peripheral surface 1S of the existing pipe 1. After the contact, when the butterfly valve 2 is further rotated in the valve closing direction, as shown in fig. 25 (c), the outer peripheral end portion R10 is pressed and deformed by the inner peripheral surface 1S of the existing pipe 1.
In the deformation at the time of valve closing, frictional resistance is generated between the outer peripheral end portion R10 and the inner peripheral surface 1S of the existing pipe 1, and a force to crimp the outer peripheral end portion R10 of the second half rubber R12 acts.
In contrast, in the case of this example, the rigidity of the outer peripheral end portion R10 of the second half-cycle rubber R12 is greater than that of the outer peripheral end portion R10 of the first half-cycle rubber R11, and therefore deformation such as curling of the outer peripheral end portion R10 of the second half-cycle rubber R12 can be prevented. Therefore, the butterfly valve 2 has high reliability of sealing performance.
On the other hand, if the rigidity of the outer peripheral end portion R10 is too high, the rotation torque of the butterfly valve 2 when the butterfly valve 2 is closed becomes large. In contrast, in the case of this example, the rigidity of the outer peripheral end portion R10 of the first half peripheral rubber R11 is lower than that of the outer peripheral end portion R10 of the second half peripheral rubber R12.
Therefore, excessive rotation torque at the time of valve closing can be suppressed.
Next, details of the cap rubber R and the upper rubber R2 in fig. 27 will be described using this example.
As shown in fig. 27 to 28B, the cap rubber R is formed in a ring shape. Thereby, the cap rubber R of fig. 27 seals the gap between the inner cap 3 and the outer peripheral surface 1F of the existing pipe 1. The cap rubber R may be fitted into a groove formed in the inner cap 3 in a non-adhesive manner. The cap rubber R may have a groove extending over the entire circumference of the cap rubber R.
As shown in fig. 29A to 31, the cap rubber R may be integrally provided with an auxiliary seal portion R4. In this example, the auxiliary seal portion R4 has a linear bar shape extending along the end surface 11f of the first opening 11 and is formed integrally with the cover rubber R.
As shown in fig. 29B, the cap rubber R may be formed by joining a die molded portion and an extrusion molded portion to each other after molding.
As shown in fig. 28A, the upper rubber R2 is formed in a ring shape and a disk shape defining a through hole Ro through which the valve rod 21 passes. The two large diameter portions R22 of the upper rubber R2 and the two small diameter portions R21 having a first diameter D1 (fig. 31) smaller than a second diameter D2 (fig. 31) of the two large diameter portions R22 are alternately arranged in a circumferential direction of the upper rubber R2.
The lower surface of the upper rubber R2 may be bonded to and supported by a circular base 29. The front end of the large diameter portion R22 of the upper rubber R2 may protrude from the base 29.
In fig. 28A, the upper rubber R2 rotates together with the valve rod 21. The upper rubber R2 has a pair of seal portions 22.
In this example, the pair of sealing portions R22 are each formed by the large diameter portion R22 protruding in the direction Dx in which the outer peripheral rubber R1 extends. The large diameter portion R22 includes a top surface F1 that contacts the inner surface 31 of the inner lid 3 in the valve-closed state, and a front end surface F2 that contacts each of the end surfaces 11F in the valve-closed state.
The pair of sealing portions R22 are configured to be in a non-sealing state between the sealing portion R22 and each of the end surfaces 11f defining the first opening 11 in a state of being separated from each of the end surfaces 11f of the pair of end surfaces 11f that are long in the tube axis direction S in the valve-opened state of the valve body 22 of fig. 27, and to be in a sealing state between the sealing portion R22 and the inner surface 31 of the inner lid 3 and between the sealing portion R22 and each of the end surfaces 11f in the valve-closed state of fig. 28A in which the valve body 22 is closed.
Next, the details of the sealing structure of the cap rubber R and the upper rubber R2 in this example will be described.
Fig. 31 (a) shows a case where the inner lid 3 is lowered downward D together with the valve rod 21 in the valve-opened state (fig. 27) just before the first opening 11 of the existing pipe 1 is closed (just before the butterfly valve is inserted). As shown in fig. 31 (a) to 31 (b), when the inner lid 3 descends downward D together with the butterfly valve, the lid rubber R contacts the outer peripheral surface 1F of the existing pipe 1, the inner lid 3 is pressed from above by the pressing piece 4, and the lid rubber R is compressed between the existing pipe 1 and the inner lid 3, whereby the existing pipe 1 and the inner lid 3 are sealed. At this time, the auxiliary seal portion R4 in the cap rubber R also seals between the existing tube 1 and the inner cap 3.
Thereafter, the butterfly valve 2 is rotated by less than about 90 ° as necessary, and the valve-opened state in fig. 27 is changed to the valve-closed state in fig. 28A. By this rotation of the butterfly valve 2, the upper rubber R2 in fig. 27 rotates together with the valve body 22 as shown in fig. 28A, and the butterfly valve 2 is thereby closed.
After the rotation of the upper rubber R2, in the valve-closed state, the upper rubber R2 performs a sealing function as follows.
That is, as shown in fig. 31 (c), the top surface F1 of the seal portion 22 is in contact with the inner surface 31 of the inner lid 3, and the front end surface F2 of the seal portion R22 is in contact with the end surface 11F of the first opening 11. In this example, the seal portion R22 is in contact with the upper rubber R2 through the auxiliary seal portion R4. This prevents water from leaking from the upper end of the butterfly valve 2.
In this example, the positioning accuracy of the inner lid 3 with respect to the first opening 11 of the existing pipe 1 in fig. 31 (a) is often required. In order to improve the accuracy, it is preferable to provide a pair of projections 301 and 302 that engage with the end surface 11f of the first opening 11 in fig. 30.
Fig. 32 shows another example of the upper rubber R2.
As shown in the figure, the upper rubber R2 may not have a small diameter portion. The pair of sealing portions R22 of the upper rubber R2 may be separated from each other as long as they contact the upper portion 21B of the valve rod 21 in the through-hole Ro.
Fig. 33 (a) to (c) show another example of the cap rubber R and the upper rubber R2.
As shown in the figure, the auxiliary seal portion R4 may protrude into the first opening 11 along the end surface 11f of the first opening 11. In this example, as shown in fig. 33 (c), the upper rubber R2 contacts the end surface 11f via the auxiliary seal portion R4.
Next, the differences between the method of the embodiment of fig. 26A to 31 and the method of example 1 will be described.
As shown in fig. 26A and 26B, in this example, the first opening 11 is formed by the cutting tool 60, and the circular opening of fig. 1A is not formed. Therefore, the butterfly valve 2 is inserted into the existing pipe 1 from the first opening 11 having substantially the same width.
That is, although the first opening 11 in fig. 2 has the circular opening 10, the first opening 11 may be a simple band-shaped opening as shown in fig. 26A. In this case, the first opening 11 can be formed only by the end mill of fig. 26A.
In this case, the first slice S1 in fig. 1A is not generated. Therefore, the inner diameter D3 of the existing pipe 1 can also be calculated as follows.
First, the outer diameter D4 of the existing pipe 1 was measured. On the other hand, the thickness T2 of the cut piece S2 was measured. The inner diameter D3 of the existing pipe 1 was calculated by subtracting a value of 2 times the thickness T2 of the slice S2 from the measured outer diameter D4.
Since other configurations and methods of the embodiment of fig. 23A to 31 are similar to those of the embodiment of fig. 1 to 22, the description thereof will be omitted.
When the existing pipe 1 is a steel pipe, burrs may be generated on the end surface 11 f. In this case, the burr removal may be performed by a cutting tool different from the cutting tool 60.
In order to cope with the variation in the inner diameter D3 of the existing pipe 1 in fig. 1A and to stop the existing pipe 1 having an approximate inner diameter D3, the outer periphery rubber R1 may be pressurized by fluid pressure.
As described above, the preferred embodiments have been described with reference to the drawings, but various changes and modifications within a scope apparent to those skilled in the art can be easily made on reading the present specification.
In the above-described embodiment, the sealed casing surrounding the existing pipe is divided into two parts, i.e., the first split casing and the second split casing, but may be divided into three or more parts.
The slider may be supported by the roller so as to be movable in the pipe axis direction.
In addition, the housing, the valve core surrounding the existing pipe may be cast or formed of steel plate. When formed of a steel plate, the first split case and the second split case may be formed integrally.
Therefore, the above-described changes and modifications are also within the scope of the present invention defined by the scope of the claims.
Industrial applicability
The butterfly valve and the non-stop method according to the present invention can be used for inserting a butterfly valve into a pipeline of an existing pipe such as a waterway or oil, and stopping the flow of fluid by inserting the butterfly valve.
Description of reference numerals:
1: an existing pipe; 1F: an outer peripheral surface; 1S: an inner peripheral surface; 10: a circular shaped opening; 11: a first opening; 12: a second opening; 11 f: an end face; 2: a butterfly valve; 21: a valve rod; 22: a valve core; 22 b: a valve body; 29: a pedestal; 21B: an upper portion; 21T: a lower end portion; 3: an inner cover; 31: an inner surface; 301. 302: a snap-fit protrusion; 4: a pressing member; 4 b: (first) a pressing bolt; 4 c: (second) pressing the bolt; 5: sealing the shell; 5 a: a first split case; 5 b: a second split case; 50: a bearing portion; 51: a first protruding tube portion; 52: a second protruding tube portion; 53: a collar; 54: a rubber gasket; 55: an outer cover; 56: a partition valve; 57: a cover plate; 60: a cutting tool; 61: a first hole saw; 62: a second hole saw (piercing tool); 7: a slider; 70: a moving member; 71: a first side; 72: a second face; 8: a working housing; 80: an airtight chamber; 81: a first piercing machine; 82: a second puncher; 83: a piercing machine; 9: a speed reducer; 90: a correction element; 92, a working tank; d: radial direction; dx: direction; df: a downstream side; sf: an upstream side; d1: a first diameter; d2: a second diameter; d3: an inner diameter; d4: an outer diameter; d10: a diameter; g1, G2: a self-sealing slot; g3, G4: an escape slot; f1: a top surface; f2: a front end face; r: a rubber for a cover; r1: a peripheral rubber; r11, R12: semi-cycle rubber; r2: an upper rubber; r3: a rubber ring; r4: an auxiliary seal portion; r21: a small diameter part; r22: a large diameter portion (seal portion); s: the direction of a pipe shaft; s1: a first slice; s2: second slicing; t1, T2: thickness; v: a service valve; w11: the width of the first opening.

Claims (15)

1. A piping structure having a butterfly valve provided in an existing pipe, wherein,
the piping structure includes:
an existing pipe (1) having a first opening (11) in the form of a long groove in the pipe axis direction (S);
an inner lid (3) that closes the first opening (11);
a valve rod (21) that extends vertically in the radial direction (D) of the existing pipe (1) and that penetrates the first opening (11); and
a butterfly-shaped valve body (22) housed in the existing pipe (1) so as to be rotatable together with the valve rod (21),
the valve body (22) is provided with:
a disc-shaped valve body (22 b);
an outer peripheral rubber (R1) disposed along the outer periphery of the valve body (22 b); and
an upper rubber (R2) which is disposed around an upper portion (21B) of the valve rod (21), is disposed in a part of the first opening (11), and rotates together with the valve rod (21),
the upper rubber (R2) is provided with a pair of sealing portions (R22), wherein the pair of sealing portions (R22) are set in a non-sealing state between the pair of sealing portions (R22) and the end surfaces (11f) in a state of being separated from each of the end surfaces (11f) of the pair of end surfaces (11f) that form the first opening (11) and are long in the tube axis direction (S) in an open valve state in which the valve body (22) is open, and are set in a sealing state in which the pair of sealing portions (R22) are sealed against the inner surface (31) of the inner lid (3) and the pair of sealing portions (R22) are sealed against the end surfaces (11f) in a closed valve state in which the valve body (22) is closed.
2. The piping structure according to claim 1,
the pair of sealing parts (R22) are respectively formed by large-diameter parts (R22) protruding along the direction (Dx) in which the outer peripheral rubber (R1) extends,
the large diameter portion (R22) has a top surface (F1) that contacts the inner surface (31) of the inner lid (3) in the valve-closed state, and a front end surface (F2) that contacts each of the end surfaces (11F) in the valve-closed state.
3. The piping structure according to claim 2,
the upper rubber (R2) is formed with a through hole (Ro) through which the valve rod (21) passes, and the upper rubber (R2) is formed in an annular and disc shape.
4. The piping structure according to claim 3,
the two large diameter portions (R22) of the upper rubber (R2) and the two small diameter portions (R21) having a diameter (D1) smaller than the diameter (D2) of the two large diameter portions (R22) are alternately arranged in series in the circumferential direction of the upper rubber (R2).
5. The piping structure according to any one of claims 1 to 4,
an annular cap rubber (R) for sealing between the inner cap (3) and the outer peripheral surface (1F) of the existing pipe (1) is fixed to the inner surface of the inner cap (3).
6. The piping structure according to claim 5,
the cap rubber (R) is provided with an auxiliary sealing part (R4) which is in contact with the sealing part (R22) in the valve-closed state.
7. The piping structure according to claim 6,
in the valve-closed state, the valve body (22) partitions the space in the existing pipe (1) into an upstream side (Sf) on which a fluid pressure acts in the existing pipe (1) and a downstream side (Df) on which the fluid pressure in the existing pipe (1) is reduced,
in the valve-closed state, self-seal grooves (G1, G2) for pressing an outer peripheral end (R10) of the outer peripheral rubber (R1) against an inner peripheral surface (1S) of the existing pipe (1) upon receiving the fluid pressure are formed on an upstream side (Sf) of the outer peripheral rubber (R1).
8. The piping structure according to claim 7,
the outer peripheral rubber (R1) includes a first half peripheral rubber (R11) and a second half peripheral rubber (R12),
the first semi-circumferential rubber (R11) is fitted to a portion of the valve body (22) that rotates from the upstream side (Sf) toward the downstream side (Df) when the valve body (22) is closed,
the second half-cycle rubber (R12) is attached to a portion of the valve body (22) that rotates from the downstream side (Df) toward the upstream side (Sf) when the valve body (22) is closed,
the rigidity of the outer peripheral end (R10) of the second half-cycle rubber (R12) is greater than the rigidity of the outer peripheral end (R10) of the first half-cycle rubber (R11).
9. The piping structure according to claim 5,
the piping structure is provided with a pressing member (4), and the pressing member (4) compresses the cover rubber (R) between the outer peripheral surface (1F) of the existing pipe (1) and the inner surface (31) of the inner cover (3) by pressing the inner surface (31) of the inner cover (3) toward the outer peripheral surface (1F) of the existing pipe (1).
10. The piping structure according to claim 1,
the existing pipe (1) is provided with a second opening (12) in a circular shape at a position opposite to the first opening (11),
the valve rod (21) has a lower end portion (21T) that penetrates the second opening (12) and has a portion protruding from the existing pipe (1).
11. The piping structure according to claim 10,
the piping structure further comprises a rubber ring (R3), wherein the rubber ring (R3) is attached to the lower end portion (21T) of the valve rod (21) and seals a gap between the lower end portion (21T) of the valve rod (21) and the inner circumferential surface (1S) of the existing pipe (1).
12. The piping structure according to claim 11,
the piping structure is provided with a pressing member (4), and the pressing member (4) presses the inner lid (3) toward the outer peripheral surface (1F) of the existing pipe (1), thereby pressing the existing pipe (1)
a. Pressing the upper rubber (R2) against the inner surface (31) of the inner lid (3);
b. the rubber ring (R3) is pressed against the inner peripheral surface (1S) of the existing pipe (1).
13. The piping structure according to claim 12,
the piping structure further comprises a sealed case (5), the sealed case (5) surrounding a portion of the existing pipe (1) where the first opening (11) and the second opening (12) are formed, an upper portion (21B) and a lower portion (21T) of the valve rod (21), and the inner lid (3),
the sealed case (5) is provided with a first protruding tube part (51) surrounding the inner cover (3) from four sides, and an outer cover (55) joined to the first protruding tube part (51) and covering the inner cover (3).
14. The piping structure according to claim 13,
the pressing piece (4) is provided with:
a plurality of first pressing bolts (4b) which are supported by the pipe wall of the first protruding pipe portion (51), advance and retreat along the tangential direction of the existing pipe (1), and press the inner cover (3) against the outer peripheral surface of the existing pipe (1); and
and a plurality of second pressing bolts (4c) that are supported by the outer cover (55), advance and retreat in the radial direction of the existing pipe (1), and press the inner cover (3) against the outer peripheral surface (1F) of the existing pipe (1).
15. A method of installing a butterfly valve (2) into an existing pipe (1), comprising:
an assembly step of assembling a sealed casing (5) that surrounds a part of an existing pipe (1) in an airtight state to the existing pipe (1);
a cutting step of forming a first opening (11) in the existing pipe (1) in a long groove shape along a pipe axis direction (S) of the existing pipe (1) by a cutting tool (60) that penetrates into the sealed housing (5);
a piercing step of piercing a second circular opening (12) in a portion facing the first opening (11) of the existing pipe (1) with a piercing tool (62) that enters the sealed housing (5);
an insertion step of inserting a butterfly-shaped valve body (22) integrated with a valve rod (21) that penetrates the first opening (11) and the second opening (12) into the existing pipe (1) through the first opening (11) in an open valve state until a lower end (21T) of the valve rod (21) protrudes from the second opening (12); and
a collar mounting step of mounting a collar (53) on the outer periphery of a lower end portion (21T) of the valve rod (21) that has entered a bearing portion (50) of a sealed housing (5) in the insertion step,
wherein the content of the first and second substances,
the method further comprises a sealing step of pressing an inner cap (3) closing the first opening (11) to compress an annular cap rubber (R) sealing a gap between the inner cap (3) and the existing pipe (1),
the sealing process is performed after the collar assembling process.
CN201880013429.0A 2017-03-14 2018-02-19 Piping structure and method for installing butterfly valve into existing pipe Active CN110366653B (en)

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PCT/JP2018/005689 WO2018168339A1 (en) 2017-03-14 2018-02-19 Insertion of butterfly valve device under continuous flow

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US10989310B2 (en) 2021-04-27
TWI687622B (en) 2020-03-11
KR102005731B1 (en) 2019-07-31
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JP6614692B2 (en) 2019-12-04
KR20180137576A (en) 2018-12-27

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